Mold for glass cylinders



Aug. 4, 1931. w. G. TwYMAN 1,317,046

MOLD FOR GLASS GYLINDERS Filed March 28. 1929 2 Sheets-Sheet i /f cui;0c

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Aug. 4, 1931. w. G. TwYMAN MOLD FOR GLASS CYLINDERS Filed Mach 28, .19292 Sheets-Sheet 2 y INVENTOR, wf///f/ Q Way/fran. BY f/ ATTORNEY.

Patented ug. 4, 1931 PATENT OFFICE WILLIAM G. TWYMANQOF POTEAU, OKLAHOMAMOLD FOR GLASS CYLINDERS Application filed. March 28, 1929.

This invention relates to molds for glass cylinders and particularly tothat type in which glass cylinders of substantially uniform diameter andthickness may be easily and quickly blown.

In the manufacture of glass cylinders it is important to have a moldthat is not unduly distorted or warped due to the eXpansion andcontraction of the various parts Y ofthe mold. Necessarily, the sidewalls of the mold are cylindrical while the bottom plate is flat and ifthe bottom plate is securely attached to the side wall member thecylindrical side wall will be distorted and Warped out of shape when theunequal eX- pansion and contraction of these parts takes place, thusmaking it almost impossible to rotate the cylinder in the mold duringthe process of blowing.

Another diiiiculty in the blowing of glass cylinders in a mold of thischaracter is the provision of a proper air vent between the side wallsand the bottom of the mold.

The present invention provides for a mold in which this unequalexpansion and contraction of the parts does not warp or distort themold7 and one in which the space between the side walls and bottom plateIis easily adjusted and regulated for different conditions of glassblowing.

The principal object of the present invention is the provision of a moldcomprising a pair of semi-cylindrical sections hingedly joined togetherand a bottom member carried by said sections in such a manner as not tointerfere with the free expansion and contraction of the individualmember of the mold.

Another object of this invention is the provision of a mold having abottom member spaced apart from the lower edges of the semi-cylindricalsections and adjustable to and from the same to vary the spacetherebetween. -J Other objects of this invention are simpliclity ofconstruction, ease and precision of operation and adaptability tovarying conditions incident to glass blowing.

With these general objects in view as well as minor objects which willappear during Serial N0. 350,533.

the course of the detailed specification, reference will now be made tothe accompanying drawings, in which;

Figure 1 is a front elevation of a mold for glass cylinders embodyingthis invention Fig. 2 is a side elevation of the same;

Fig. 3 is a plan view of Fig. l;

Fig. 4 is a horizontal section taken on line V-IV of Fig. 1;

Fig. 5 is a horizontal section taken on line V-V of Fig. l;

Fig. 6 is an enlarged fragmentary section taken on line VI-VI of Fig. 4;

Fig. 7 is an enlarged fragmentary sectional view taken on line VII-VIIof Fig. 41;

Fig. l8 is a sectional plan view showing a modified form of bottom plateand supporting means therefore;

Fig. 9 is an enlarged sectional view taken on line IX-IX of Fig. 8;

Fig. 10 is an enlarged sectional view taken on line X-X of Fig. 8.

Similar reference characters designate like parts throughout the severalviews and the numerals 10 and 11 designate cooperating elongatedsemi-cylindrical half-sections respectively. These half-sections lO and11 constitute the side walls of the mold and are hingedly joinedtogether by means of straps 13 and pintles 14. It will be noted thatstraps 13 on the half-section 11 are so positioned as to rest on top ofthe straps secured to half section 10 when the lower edges of the twohalf-sections are in a common plane. Section 10 is rigidly mounted on asuitable support S by means of brackets 15 which are securely attachedby riveting or welding to said section and to said support by means ofsecuring members 16. Each of said half-sections are provided withperforations 17 which serve as air vents during the operation of formingthe cylinder. The section 11 may be opened and closed relative to thestationary section by means of an operating lever 18 which is piv`otally mounted at19 to section 11. The inner end of lever 18 is providedwith a hooked portion 2O which is adapted to engage pin 21 carried bysection 10 to secure said halfsections in cooperative relation. lVlienit is desired to move section l1 to the open position, lever 18 is movedupwardly until hook 20 disengages pin 21 and then section 11 may beswung on its hinge to the open position as shown in Fig. 4. This openingmust be of sufficient extent to allow the removal of the formedglass'cylinder fromA the mold. W'hile I have-shown this-simple meansvforoperation and securing section ll in position, vyetitis apparent thatmany other means might be used.

In ord-er to properly form the .glasscylinder it is very essential thata fiat'base plate perpendicular to the axisofthe mold'and slightlyspaced apart therefrom, be provided. Furthermore,dueto the `fact thatwh-envthe heatedglass comes in contact with the mold Yparts during theprocessof blowing, these .2O v=parts-will expandand contract and it isnecessary thaty each element ofthe mold be free to expand and contractindependently ofthe other parts. Tovmeet" these requirements, the

ibase plate 22 is carried'bysections 10 and il through th-e intermediacyo'fthe'vdepending carryinglugs 23 which are securely attached to theirrespective half-section and threaded `at their'lowerportionto-receivebearing nuts 24 and loclrnuts 25. One of said carryingrvlugs mountedonLsectionlO'extends through a ihole 26'in has-e plate 22with nuts 24 and 25 positioned below said plate. Plate 22 isIalSOprovided' with enlargedA holes 27 in which are mounted other-carryinglugs 23. Openings 27 are of suiiicient size fto permit relativetransverse movementibetween said half r-section and base member as thekparts expand `-andcontraetrlhe portion ofthe base plate 22 adjacent thelower-edge of Ysection llis 'provided with" notches 28-y which 2areadapted :to freeeive :thel carrying ilugs 23 -securelymountedf'on-sect-ion 11. When lllis in the closed position bearing nuts24 engage the lower surfacefo'f plate 22to support `said plate. ithfthis construction f it isl apparent that the member 'il maybe moved toyfand VE'from the closed position while the base-plate 22 remainsin-substantially thesame relative pesitionfto'secti'on 10. Y

To varytthe distance-between thelower ends of the members 10 and 1l andthe base plate .22 'in order to obtainthe proper Aair vent lhavevprovided bearing-nuts 24 and 'lock nuts 25' which m ay beset -atany' position.

These nuts alsoserve-tofpermit the adjusting of -the uppersurfacel of'thebase-plate 22 at 'right 'angles'to-the axis ofthe mold.

In order to maintain base plate 22 inV proper -alinement when section 11is moved to the openl position, bearing screws29 are threadedthroughplate 22and bear against the adjacent1 edge of lsection Y10,'thus Vpreventing the tilting ofthe base'l platev FigsLS, 9 and 10 areoffa modified form in which inturned channel 1 members '301 aref se- Icurely attached lto fthe Y mold sections ll() and .areadjustable toimpinge the upper side of plates 8l and cooperate with said channels t0inaintainthebase plateSl in a fixed position relative to the aXis of themold.

In order to obtain a proper facing for the inner surface of sections 10and 1l and also the upper face of the base plate 2 2, a thin coat ofcarbon may beburned thereon, thus 'foi-ming Ia smooth carbon glaze. This'pre- `vents theiglass from coming in contact with theiion and alsoproducesa smooth: surface thus facilitating the easy rotation oftheglass lcylinder during the operationl of forming.

lt is apparent that'this'invention provides for amold iii which theexpansionandfl contract-ion of any onev of the parts v.will not'tend towarp or distortl any otherpart andfone'in which the space between thesidewalls and 4base plate may be varied'to suit'the class of work beingdone.

While l Vhave illustrated and fdescribed wliatvis now deemed toconstitute thevpre ferred form of embodiment of theinvention, I desireto reserve theright tomake.: all such formal changes or modiiicationsasmay fairly fall wit-hin the scope of .the appended claims.

W hat Iy claim is:

l. A mold of the character describedfcomprising a pair/ofsemi-cylindrical sections liingedly joined together, anda Iremovablebase plate carried adjacent its outer edge/by said. sections and spacedapart therefrom.

2. il mold of the character describedfcom- VprisinO a pair ofsemi-cylindrical half-sections hingedly joined together,.a baseiplatecarried by said half sections, and ineans'to move said'baseplate-towards and lfrom said half-section.

8. Amold of the character describedcomprising a vpair ofsemi-cylindricalhalf-sections hingedly joined together, a'base plate 1'vertically adjustably cairiedby Ysaid halfvsections, said baseplatelbeing mountedto permit a limited transverse movementthereofrelative to said'half-sections.

d. Aniold of the characterdescribed comprising apair of elongatedsemi-cylindrical half-sections hingedly `joined together, and a baseplate carried by said half-sections and positioned in spaced apartrelation therewith, said base plate being mounted for .alimitedtransverse movement Vrelative to said lhalf sections when theniold isinthe operative position.

5. A mold ofthe character described vconi- V.prising a pair ofsemibylindrical sections lili? hingedly joined together, and a baseplate removably carried by said sections and positioned in spaced apartrelation therewith, said base plate being adjustable to and from saidsections and having a limited relative transverse movement thereto.

6. A mold of the character described comprising a pair of elongatedsemi-cylindrical half-sections hingedly joined together, meansY foranchoring one of said ha1f-sec tions to a support, means for opening andclosing the other of said half-sections relative to said anchoredhalf-section, a base plate carried by said half-sections for limitedtransverse movement therewith.

7. A mold of the character described, comprising a pair of elongatedsemi-cylindrical cooperating half-sections, one of said halfsectionsbeing anchored to a support, means for moving the other of saidhalf-sections to and from the operative position With said anchoredhalf-section, a base plate supported by said anchored half-section forlimited transverse movement, means carried by said movable half-sectionadapted to support said base plate when the half-sections are incooperative relation.

8. A mold of the character described comprising a pair ofsemi-cylindrical half sections hingedly joined together, means forsecuring one of said half-sections to a support, means for oscillatingthe other of said halfsections relative to the secured half-sections, abase plate carried by said half-sections and spaced apart therefrom, toform an air vent therebetween, said base plate being mounted to permit alimited transverse movement thereof relative to said half sections Whenthe mold is in the closed position, and means for adjusting said baseplate to and from said half-sections- 9. A mold of the characterdescribed comprising a pair of semi-cylindrical half-sections hingedlyjoined together, means for securing one of said half-sections to asupport, means for oscillating the other of said halfsections relativeto the securing half-sections, means for securing said half-sections inthe closed position, a base plate carried by said half-sections andspaced apart therefrom to form an air vent therebetween, said base platebeing mounted to permit a limited transverse movement thereof relativeto said halfsections when the mold is in the closed position, and meansfor adjusting said base plate to and from said half-sections.

In testimony whereof I hereunto affix my signature.

WILLIAM G. TWYMAN.

